| PaO2 | Arterial oxygen tension, or partial pressure |
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| PAO2 | Alveolar oxygen tension, or partial pressure |
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| PaCO2 | Arterial carbon dioxide tension, or partial pressure |
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| PACO2 | Alveolar carbon dioxide tension, or partial pressure |
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| PvO2 | Oxygen tension of mixed venous blood |
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| P(A-a)O2 | Alveolar-arterial oxygen tension difference. The term formerly used (A-a DO2) is discouraged. |
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| P(a/A)O2 | Alveolar-arterial tension ratio; PaO2:PAO2 The term oxygen exchange index describes this ratio. |
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| C(a-v)O2 | Arteriovenous oxygen content difference |
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| SaO2 | Oxygen saturation of the hemoglobin of arterial blood |
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| SpO2 | Oxygen saturation as measured by pulse oximetry |
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| CaO2 | Oxygen content of arterial blood |
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| pH | Symbol relating the hydrogen ion concentration or activity of a solution to that of a standard solution; approximately equal to the negative logarithm of the hydrogen ion concentration. pH is an indicator of the relative acidity or alkalinity of a solution |
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